<https://ijunkie.com/how-to-downgrade-iphone-3g-from-ios-4-to-iphone-os-3-1-3/>
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"How To Downgrade iPhone 3G From iOS 4 To iPhone OS 3.1.3"
<https://ijunkie.com/how-to-downgrade-iphone-3g-from-ios-4-to-iphone-os-3-1-3/>